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Added clarification in doc section on elastic scattering regarding scattering cosine in lab.

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Paul Romano 2012-07-24 17:43:07 -04:00
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docs/source/methods/physics.rst
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@ -137,6 +137,11 @@ scattering cosine in the lab system can be calculated as
\mu_{lab} = \frac{1 + A\mu}{\sqrt{A^2 + 2A\mu + 1}}.
However, this formula is only valid if the target was at rest. When the target
nucleus does have thermal motion, the cosine of the scattering angle can be
determined by simply taking the dot product of the neutron's initial and final
direction in the lab system.
.. _freegas:
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